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Multifocal lens

a multi-focal lens and lens technology, applied in the field of multi-focal lenses, can solve the problems of affecting the vision of the eye, the smallest diffraction order longitudinal chromatic aberration is disadvantageous, and the topographic steps on the lens surface are particularly disturbing, so as to achieve the effect of improving vision

Active Publication Date: 2015-12-29
CARL ZEISS MEDITEC AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is an eye lens that can improve vision in different ranges. It is designed to help people see better in the near, middle, and far ranges. This improves overall vision and helps people see more clearly.

Problems solved by technology

If such lenses are to be employed as ophthalmic lenses (e.g. contact lenses, intraocular lenses), then, in particular the longitudinal chromatic aberration in the smallest of the principal powers is disadvantageous.
Namely, this power is then used for imaging far objects, and a longitudinal chromatic aberration associated with the −1st diffraction order is particularly disturbing in such a use.
Topographic steps on a lens surface are disadvantageous for several reasons: usually, such steps are difficult or not to be produced with the required precision.
Furthermore, such steps are detrimental to the wearing comfort in ophthalmic lenses such as contact lenses.
In this context, a trifocal lens is also mentioned, in which the individual zones have different averaged powers, and moreover disadvantageously longitudinal chromatic aberrations occur both in the smallest and in the greatest of the three principal powers.

Method used

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Examples

Experimental program
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Embodiment Construction

[0103]In the figures, similar or functionally similar elements are provided with the same reference characters.

[0104]In FIG. 1, in a sectional representation, a part of a trifocal lens 1 with diffractive and refractive powers known from the prior art according to U.S. Pat. No. 6,536,899 is shown. The lens 1 has a longitudinal chromatic aberration both in the smallest and in the greatest of the three principal powers, as the dashed curve in FIG. 2 shows. In FIG. 2, on the vertical axis, the relative intensity is plotted and on the horizontal axis the lens power in diopters is plotted. The relatively large intensities IR of the three principal powers are apparent, wherein the solid line is represented for monochromatic light at a design wavelength of 550 nm, and the dashed line is taken as a basis for polychromatic light with a Gaussian distribution in the wavelength range between 450 nm and 650 nm. The intensity for 450 nm and 650 nm, respectively, is 20% of the maximum intensity for...

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PUM

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Abstract

A multifocal lens has a number n>2 of principal powers, of which at least one principal power is refractive and at least one principal power is diffractive. The multifocal lens includes a first lens portion having at least one first annular zone and at least a second lens portion having at least one second annular zone, wherein the zones each have at least one main sub-zone and at least one phase sub-zone. For forming the n principal powers, a maximum of n−1 lens portions are combined, and an averaged refractive power of a zone of the first lens portion is equal to an averaged refractive power of a zone of the second lens portion.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation application of international patent application PCT / EP2011 / 056552, filed Apr. 26, 2011, designating the United States and claiming priority from German application 10 2010 018 436.5, filed Apr. 27, 2010, and the entire content of both applications is incorporated herein by reference.FIELD OF THE INVENTION[0002]The invention relates to a multifocal lens with a number n>2 of principal powers, wherein at least one principal power is refractive and at least one further principal power is diffractive. The multifocal lens includes a first lens portion having at least one first annular zone and includes at least a second lens portion having at least one second annular zone. The zones are each formed at least with a main sub-zone and with at least a phase sub-zone.BACKGROUND OF THE INVENTION[0003]Multifocal lenses with refractive and diffractive powers are known from U.S. Pat. No. 6,536,899. These lenses have...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02C7/04G02C7/06
CPCG02C7/041G02C7/06G02C2202/20G02C7/04G02C7/044G02C7/061
Inventor FIALA, WERNERGERLACH, MARIO
Owner CARL ZEISS MEDITEC AG